And the eating right before your eyes is if you are lucky. The next worse thing is the acid paricials get into the air steam, and cause all kinds of breathing issues. All joking aside, it has been noted by several techs, including my self, the the improper use of coil cleaning concentrate, especially when it has not been properly cleaned off will cause the vapors to rise and settle into the blower motor. Once this happens, it will eat away a the stater coil in side the blower fan motor and cause it to burn out. Some home owners have been known to get hold of coil cleaning products, but if you have not been properly trained, I highly recomend having someone either comb to you home and perform a cleaning, or clean the coil using a mild soap, and througly rinsing the coil, taking care not to bend the fins. If you bend the fins, use a come to open them back up. Bent fins cause resistance to the air stream, and prevent the evaporator coil from exchanging heat from the air to the refrigerant inside the coil.